MC908GR16ACFA FREESCALE [Freescale Semiconductor, Inc], MC908GR16ACFA Datasheet - Page 127

• Manufacturer Part Number: MC908GR16ACFA
• Description: M68HC08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

12.5.3 Port D Input Pullup Enable Register
The port D input pullup enable register (PTDPUE) contains a software configurable pullup device for each
of the eight port D pins. Each bit is individually configurable and requires that the data direction register,
DDRD, bit be configured as an input. Each pullup is automatically and dynamically disabled when a port
bit’s DDRD is configured for output mode.
PTDPUE7–PTDPUE0 — Port D Input Pullup Enable Bits
12.6 Port E
Port E is a 6-bit special-function port that shares two of its pins with the enhanced serial communications
interface (ESCI) module.
12.6.1 Port E Data Register
The port E data register contains a data latch for each of the six port E pins.
PTE5-PTE0 — Port E Data Bits
Freescale Semiconductor
These writable bits are software programmable to enable pullup devices on an input port bit.
These read/write bits are software-programmable. Data direction of each port E pin is under the control
of the corresponding bit in data direction register E. Reset has no effect on port E data.
1 = Corresponding port D pin configured to have internal pullup
0 = Corresponding port D pin has internal pullup disconnected
Alternative
Address:
Function:
Address:
Data direction register E (DDRE) does not affect the data direction of port
E pins that are being used by the ESCI module. However, the DDRE bits
always determine whether reading port E returns the states of the latches
or the states of the pins. See
Reset:
Read:
Write:
Reset:
Read:
Write:
Figure 12-16. Port D Input Pullup Enable Register (PTDPUE)
PTDPUE7
$000F
Bit 7
$0008
Bit 7
0
0
PTDPUE6
= Unimplemented
Figure 12-17. Port E Data Register (PTE)
6
0
6
0
MC68HC908GR16A Data Sheet, Rev. 1.0
PTDPUE5
PTE5
5
0
5
Table
PTDPUE4
NOTE
Unaffected by reset
PTE4
12-6.
4
0
4
PTDPUE3
PTE3
3
3
0
PTDPUE2
PTE2
2
2
0
PTDPUE1
PTE1
RxD
1
1
0
PTDPUE0
PTE0
Bit 0
TxD
Bit 0
0
Port E
127